Balloon tire jack



April 14, 1936.

J. W. BATE BALLOON TIRE JACK Original Filed Oct. 15, 1927 2 Sheets-Sheet l 12 .2/ 15 E5 g i1 1" r 5| I 26 i I n a /\-I I 6 l 'fz' 125. I K 2 l1 l J9 si 5 1 J9 l I I i 5 s i 19 L V 1.9 4 I T 4 J0 1 J23; L:

J. W. BATE BALLOON TIRE JACK April 14, 1936.

Original Filed Oct. 15, 192'? 2 Sheets-Sheet 2 mmmmmmmmmmmfi I Jozfiaze, I If 1 (13y 1223 G3,."

Reissued Apr. 14, 1936 BALLOON John W. Bate, Racine,

TIRE JACK Wis., assignor to Walker Manufacturing Company, Racine, Wis., a corporation of Wisconsin Original No. 1,844,629,

Serial No. 226,374, October 15, 1927.

dated February 9. 1932, Renewed December 4, 1931. Application for reissue January 23, 1933, Serial No. 653,109

18 Claims.

This invention relates to balloon tire jacks and the like.

An object of the invention is to provide a. strong durable Jack and one which at the same time can be manufactured economically.

This and other objects which will hereinafter appear are accomplished by this invention which is fully described in the following specification and shown in the accompanying drawings, in which Fig. 1 is a vertical section on the line ll of Fig. 2;

Fig. 2 is a horizontal section on the line 2-2 of Fig. 1;

Fig. 3 is a partial vertical section on the line 33 of Fig. 1 showing a modified form of the cup; and

Fig. 4 is a section on the broken line 44 of Fig. 1.

The embodiment illustrated comprises a screw jack of the double lift type now conmionly used on cars having balloon tires. This lack comprises a base ill, a. housing I I, a nut l2 and. outer and inner screw members l3 and M respectively. The nut I2 is provided on its periphery with a bevel gear l5 which meshes with a bevel pinion I6 on the shaft II. An integral lateral extension or arm II on the housing ll provides a. bearing for the shaft IT.

The base l0 and housing II are stamped or pressed from sheet metal, the housing ll being secured to the base ill by means of rivets I8 or the like. The housing II is made up of two substantially symmetrical sections each formed with reinforcing edge flanges, the flanges of the two sections being secured together by a series of spot-welds I9, so as to form a reinforced tubular d The housing II is enlarged at ll to partially 4o enclose the bevel pinion It. This housing has an enlarged portion ll at the top which enclosesa cup which is preferably pressed or drawn from sheet metal. The cup 20 is secured to the enlarged portion II" by means of a series of rivets 2| near the top. This serves also to stiffen the upper portion of the housing above the point where the spot-welds occur.

The nut I2 is provided on its lower face with a hub 22 in which is formed an annular groove 23 which is adapted to receive a screw 24 for preventing the removal of the nut.

The hub 22 rests upon a ball bearing 25, which in turn rests upon a shoulder 26 of the cup 2|] which in turn rests upon a ledge forming the bottom of the enlarged portion H". The cup 20 is further stepped to provide a. portion 21 which fits inside the central portion ll of the housing the cup 20 terminating in a reduced portion 28 which substantially fits the outer diameter of the outer screw member I3. Thus, an annular chamber or recess 29 is formed in which is placed a felt strip, ring or the like 30 which is adapted to receive and hold oil for lubricating the outer screw l3. Thus lubricating this outer screw enables it to turn more freely in the nut I2. The felt ring 30 also bears upon the screw l3 and provides some friction so as to prevent it from turning so readily with respect to the housing when the nut I2 is being turned. The friction thus produced by the felt ring 30 may be suflicient to hold the screw l3 so as to produce the necessary longitudinal movement to cause this screw to move up or down as the nut I2 is turned.

While the above friction means may be sufficient to add the friction necessary to raising and lowering the screw I3, I have also provided another and more effective means for accomplishing this same purpose if desired. This consists of an enlarged bottom 3| on the screw l3 which has an annular groove 32 therein in which is placed a. fiat spring member 33, the ends of which are bent and enter a hole 34 drilled in the side as shown in Fig. 4. Any desired amount of friction may thus be applied by putting in a spring 33 of the desired stifiness. The walls ll are cylindrical and of the same diameter throughout so that the friction spring 33 will give about the same resistance at all points.

Thus it will be seen that when the nut I2 is turned to raise the jack, the two screw members l3 and M will move up until the cap It encounters the load to be lifted.

In Fig. 3 is shown a modified form of the device in which the cup 20 is made of two parts 20* and 20 which have overlapping flanges.

While I have shown and described but a single embodiment of this invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made which do not depart from the spirit and scope of the invention as disclosed in the appended claims.

I claim:

1. In a screw jack, a screw, a nut revoluble thereon and having a hub, a. thrust bearing assembly beneath the hub, a pressed-metal housing having a. longitudinal passage for said screw and an enlargement adapted to receive said hub and bearing, a metal cup within such enlargement, a rotary shaft extending laterally from u said nut for turning the same, said housing providing an integral bearing for said shaft.

2. In a screw jack, a screw, a nut revoiuble thereon and having a hub, a thrust bearing assembly beneath the hub, a pressed-metal housing having a. longitudinal passage for said screw and an enlargement adapted to receive said hub and bearing, a metal cup within said enlarge ment, a rotary shaft extending laterally from said nut for turning the same, said housing being formed of two sections meeting on a longitudinal plane and secured together, said housing providing an integral bearing for said shaft.

3. In a screw jack, a screw, a nut revoiuble thereon and having a hub, a thrust bearing assembly beneath the hub, a pressed-metal housing having a, longitudinal e for said screw and an enlargement adapted to receive said hub and bearing, a shaft extending laterally from said nut for turning the same, said housing providing an integral bearing for said shaft, and a pressed-metal cup within said enlargement and secured thereto, said cup surrounding 'said hub and thrust-bearing.

4. In a screw jack, a screw, a nut revoiuble thereon and having a hub, a thrust bearing assembly beneath the hub, a pressed-metal housing having alongitudinal passage for said screw and an enlargement adapted to receive said hub and bearing, a shaft extending laterally from said nut for turning the same, said housing being formed of two sections meeting on a longitudinal plane and secured together, said housing providing an integral. bearing for said shaft, and a pressed-metal cup within said enlargement and secured thereto, said cup surrounding said hub and thrust bearing.

5. In a screw jack, a screw, a nut screwed thereon for raising and lowering the screw, means for turning said nut, a thrust bearing for taking the load on said nut, a metal cup around said screw and bearing, there being an annular space between said cup and screw, and a lubricant bearing material in said annular space. i

6. In a screw jack, a screw, a nut screwed thereon for raising and lowering the screw, means for turning said nut, a thrust bearing for taking the load on said nut, a metal cup around said screw and bearing, there being an annular space between said cup and screw, and a lubricant bearing material in said annular space, said material tending also as a friction member to prevent rotation of said screw.

'7. In a'screw jack, a casing, a nut revolubly mounted in said casing, means for turning said nut, an outer screw threaded in said nut, an inner rotatable screw threaded in said outer screw, said outer screw having a base formed with an outer annular recess, a spring partially confined within the recess and encircling the base and frictionally engaging the casing.

8. In a screw jack, a casing, a nut revolubly mounted in said casing, means for turning said nut, an outer screw threaded in said nut, an inner rotatable screw threaded in said outer screw, said outer screw having a base provided with a depression, and a spring member encircling said base and frictionally engaging the casing and having a portion thereof embraced within said depression.

9. In a screw jack, a casing, a nut revolubly said outer screw, and a spring member looped about the base of said outer screw and frictionally engaging the casing having a portion thereof embraced within said slot.

10. In a screw jack, a screw having an exterior thread, a housing having a longitudinal passage for said screw and an enlargement near its upper end, a metal cup secured within said enlargement, a nut revolubly mounted in said cup and. engaging said screw, and an oil swab surrounding said screw.

11. In a screw jack, in combination with a lifting screw, a nut revoiuble thereon, an antifriction thrust bearing assembly surrounding the screw beneath the nut, and a rotary shaft extending laterally from the nut and having connections therewith to turn the nut, a casing comprising a sheet metal base plate and a plurality of sheet metal standard members adapted to be secured together and to the base plate and each formed to enclose a portion of an upright passage to receive the screw, an upper chamber to receive and support the nut and bearing assembly, and a bearing for the shaft.

12. In a screw jack, in combination with a lifting screw, a nut revoluble thereon, an anti-friction thrust bearing assembly surrounding the screw beneath the nut, and a rotary shaft extending laterally from the nut and having connections therewith to turn the nut, a casing comprising a sheet metal base plate and a pair of similar sheet metal standard members adapted to be secured together and to the base plate and each formed to enclose a portion of an upright passage to receive the screw, an upper chamber to receive and support the nut and bearing as sembly, and a bearing for the shaft.

13. In a screw jack, in combination with a lifting screw, a nut revoiuble thereon, an anti-fric tion thrust bearing assembly surrounding the so screw beneath the nut, and a rotary shaft extending laterally from the nut and having connections therewith to turn the nut, a casing comprising a sheet metal base plate and a pair of similar sheet metal standard members adapted to be secured together and to the base plate and each formed to enclose one-half of an upright passage to receive the screw, an upper chamber to receive and support the nut and bearing assembly, and a bearing for the shaft.

14. In a screw jack, in combination with a. lifting screw, a nut revoiuble on the screw, a thrusts bearing assembly surrounding the screw beneath the nut, a rotary driving shaft extending laterally from the nut, and gear connections between the shaft and nut, a casing formed to provide a supporting base, an upright standard in which is an upright passage to receive the screw, an upper chamber to receive, support and partially enclose the nut and thrust bearing assembly and a bearing for the laterally extending shaft, the

casing comprising a pair of sheet metal standard members adapted to be secured together, each of the members being formed to provide-a portion of the upright passage, the upper chamher and the bearing.

15. In a screw jack, in combination with a. lifting'screw, a nut revoluble on the screw, a thrust-bearing assembly surrounding the screw beneath the nut, a. rotary driving shaft extending laterally from the nut, and gear connections between the shaft and nut, a casing formed to provide a supporting case, an upright standard in which is an upright passage to receive the screw,

an upper chamber to receive, support and par- 7 tially enclose the nut and thrust-bearing assembly and a bearing for the laterally extending shaft, the casing comprising a pair of sheet metal standard members adapted to be secured together, each of the members being formed to provide substantially one-half of the upright passage, the upper chamber and the bearing.

16. In a screw jack, in combination with a lifta ing screw, a nut revoluble on the screw, a thrustbearing assembly surrounding the screw beneath the nut, a rotary driving shaft extending laterally from the nut, and gear connections between the shaft and nut, a casing comprising a. pair of sheet metal standard members adapted to be secured together and each formed to enclose a portion of an upright passage to receive the screw, a portion of an upper chamber which receives, supports and partially encloses the nut and thrust-bearing assembly, and a portion of a bearing for the laterally extending shaft.

17. In a screw jack, in combination with a lifting screw, a nut revoluble thereon, a thrust-bearing assembly surrounding the screw beneath the nut, a rotary driving shaft extending laterally from the nut and gear connections between the shaft and nut, a casing formed to provide an upright standard in which is a tubular guide passage for the screw, an upper chamber to support the nut and thrust-bearing assembly, and a hearing for the laterally extending shaft, the casing comprising a pair of similar metallic half sections adapted to be secured together, each of the sections being formed to provide substantially half of the upright guide passage, the upper chamber and the bearing.

18. In a screw jack, in combination with a lifting screw, a nut revoluble thereon, a thrustbearing assembly surrounding the screw beneath the nut, a rotary driving shaft extending lateral- 1y from the nut and gear connections between the shaft and nut, a casing formed to provide a supporting base, an upright standard in which is a tubular guide passage for the screw, an upper chamber to support the nut and thrust-bearing assembly, and a bearing for the laterally extending shaft, the casing comprising a pair of similar metallic half sections adapted to be secured together, each of the sections being formed to provide substantially half of the upright guide passage, the supporting base, the upper chamber and the bearing.

JOHN W. BATE. 

